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ADV7180 数据表(PDF) 5 Page - Analog Devices |
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ADV7180 数据表(HTML) 5 Page - Analog Devices |
5 / 120 page Data Sheet ADV7180 Rev. G | Page 5 of 120 INTRODUCTION The ADV7180 is a versatile one-chip multiformat video decoder that automatically detects and converts PAL, NTSC, and SECAM standards in the form of composite, S-Video, and component video into a digital ITU-R BT.656 format. The simple digital output interface connects gluelessly to a wide range of MPEG encoders, codecs, mobile video processors, and Analog Devices digital video encoders, such as the ADV7391. External HS, VS, and FIELD signals provide timing references for LCD controllers and other video ASICs that do not support the ITU-R BT.656 interface standard. The different package options available for the ADV7180 are shown in Table 2. ANALOG FRONT END The ADV7180 analog front end comprises a single high speed, 10-bit analog-to-digital converter (ADC) that digitizes the analog video signal before applying it to the standard definition processor. The analog front end employs differential channels to the ADC to ensure high performance in mixed-signal applications. The front end also includes a 3-channel input mux that enables multiple composite video signals to be applied to the ADV7180. Current clamps are positioned in front of the ADC to ensure that the video signal remains within the range of the converter. A resistor divider network is required before each analog input channel to ensure that the input signal is kept within the range of the ADC (see Figure 27). Fine clamping of the video signal is performed downstream by digital fine clamping within the ADV7180. Table 1 shows the three ADC clocking rates that are determined by the video input format to be processed—that is, INSEL[3:0]. These clock rates ensure 4× oversampling per channel for CVBS mode and 2× oversampling per channel for Y/C and YPrPb modes. Table 1. ADC Clock Rates Input Format ADC Clock Rate (MHz)1 Oversampling Rate per Channel CVBS 57.27 4× Y/C (S-Video)2 86 2× YPrPb 86 2× 1 Based on a 28.6363 MHz crystal between the XTAL and XTAL1 pins. 2 See INSEL[3:0] in Table 107 for the mandatory write for Y/C (S-Video) mode. STANDARD DEFINITION PROCESSOR The ADV7180 is capable of decoding a large selection of baseband video signals in composite, S-Video, and component formats. The video standards supported by the video processor include PAL B/D/I/G/H, PAL 60, PAL M, PAL N, PAL Nc, NTSC M/J, NTSC 4.43, and SECAM B/D/G/K/L. The ADV7180 can automatically detect the video standard and process it accordingly. The ADV7180 has a five-line, superadaptive, 2D comb filter that gives superior chrominance and luminance separation when decoding a composite video signal. This highly adaptive filter automatically adjusts its processing mode according to the video standard and signal quality without requiring user intervention. Video user controls such as brightness, contrast, saturation, and hue are also available with the ADV7180. The ADV7180 implements a patented ADLLT™ algorithm to track varying video line lengths from sources such as a VCR. ADLLT enables the ADV7180 to track and decode poor quality video sources such as VCRs and noisy sources from tuner outputs, VCD players, and camcorders. The ADV7180 contains a chroma transient improvement (CTI) processor that sharpens the edge rate of chroma transitions, resulting in sharper vertical transitions. The video processor can process a variety of VBI data services, such as closed captioning (CCAP), wide screen signaling (WSS), copy generation management system (CGMS), EDTV, Gemstar® 1×/2×, and extended data service (XDS). Teletext data slicing for world standard teletext (WST), along with program delivery control (PDC) and video programming service (VPS), are provided. Data is transmitted via the 8-bit video output port as ancillary data packets (ANC). The ADV7180 is fully Macrovision® certified; detection circuitry enables Type I, Type II, and Type III protection levels to be identified and reported to the user. The decoder is also fully robust to all Macrovision signal inputs. Table 2. ADV7180 Selection Guide Part Number Package Type Analog Inputs Digital Outputs Temperature Grade ADV7180KCP32Z 32-lead LFCSP 3 8-bit −10°C to +70°C ADV7180WBCP32Z (Automotive)1 32-lead LFCSP 3 8-bit −40°C to +85°C ADV7180BCPZ 40-lead LFCSP 3 8-bit −40°C to +85°C ADV7180WBCPZ (Automotive)1 40-lead LFCSP 3 8-bit −40°C to +125°C ADV7180BSTZ 64-lead LQFP 6 8-bit/16-bit −40°C to +85°C ADV7180WBSTZ (Automotive)1 64-lead LQFP 6 8-bit/16-bit −40°C to +125°C ADV7180WBST48Z (Automotive)1 48-lead LQFP 6 8-bit −40°C to +85°C 1 Automotive qualification completed. |
类似零件编号 - ADV7180_12 |
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类似说明 - ADV7180_12 |
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